Alameda County Flood, Wildfire & Earthquake Hazard Map

Map layers

Location

Flood & inundation

CAL FIRE

CGS Earthquake Zones

Faults

Tsunami

Recent activity

Checking official mapped data only when a layer is opened.

ZIP 94601ZIP-based location

ZIP boundary viewCounty fallback

Official public layersLoaded on demand by independent StayReady

Summary

How to read this map

Address point checkedThe selected coordinate was compared with an available official layer.

Mapped match foundThe point falls inside that dataset's boundary. This does not predict damage.

No mapped matchThe point is outside the displayed boundary; related hazards may still occur.

Not checkedStayReady did not receive enough source data to compare this layer with the selected address.

Official source, provisional StayReady integrationUseful for planning, not a legal, engineering, insurance, or safety determination.

Layer definitions and sources

FEMA flood zones: Floodplain-management and insurance mapping; not every flood mechanism.

FEMA Zone X: Generally outside the Special Flood Hazard Area or with lower or undetermined mapped flood hazard. It does not mean flooding cannot occur.

CAL FIRE zones: Effective SRA zones and 2025 LRA recommendations are labeled separately. Recommendations are not presented as locally adopted zones. Neither is live fire or evacuation tracking.

CGS liquefaction: Areas where strong shaking may cause wet, loose soil to lose strength.

CGS landslide: Slopes where earthquake shaking may trigger landslides.

Fault zones: Surface-fault context; not a forecast of shaking or damage.

Tsunami areas: Coastal hazard and evacuation-planning areas.

Dam failure inundation: A planning boundary showing where water could travel if a mapped dam or critical structure failed. For example, one downstream area may appear in several hypothetical dam scenarios. These boundaries are not predictions or live evacuation maps. Actual evacuation instructions come from local emergency officials.

Open official DWR/DSOD inundation map source Open official CGS source: CGS Alquist-Priolo Earthquake Fault Zones Open official CGS source: CGS Liquefaction Zones Open official CGS source: CGS Earthquake-Induced Landslide Zones Open official CGS source: California Tsunami Hazard Areas

Learn more about map sources

Map information as a list

The map is optional. This list names every available layer and whether the saved summary marked it as relevant. Open the summary for complete findings, non-matches, unavailable checks, and limitations.

ZIP boundary: approximate display context; never address evidence.
FEMA flood zones: not marked in the saved summary; open the layer to check availability.
CAL FIRE hazard severity zones: effective SRA zones and 2025 LRA recommendations are distinct; local LRA adoption is not assumed. Not marked in the saved summary; open the layer to check availability.
Mapped fault traces: not marked in the saved summary; open the layer to check availability.
DWR/DSOD dam-failure scenarios: not marked in the saved summary; open the layer to check availability.
CGS Alquist-Priolo Earthquake Fault Zones: not marked in the saved summary; open the layer to check availability. Official source.
CGS Liquefaction Zones: not marked in the saved summary; open the layer to check availability. Official source.
CGS Earthquake-Induced Landslide Zones: not marked in the saved summary; open the layer to check availability. Official source.
California Tsunami Hazard Areas: not marked in the saved summary; open the layer to check availability. Official source.

Read the complete text summary

StayReady is an independent educational tool using official public data. It is not an official emergency service and does not replace AC Alert, evacuation orders, 911, or instructions from public agencies. California Geological Survey · Official source, provisional StayReady integration. This application uses information from the California Geological Survey. It is not officially endorsed by that agency. California DWR/DSOD · Official mapped planning source, provisional StayReady integration. StayReady is not officially endorsed by DWR or DSOD.